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Financial Instruments (Schedule of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |
Long-term debt | $ 284,369 | $ 303,875
Less: current portion | (1,265) | (3,764)
Long-term debt, net of current portion | 283,104 | 300,111
Private Placement, Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 100,000 | 100,000
Interest rate | 6.84% |
Maturity date | Oct. 25, 2017 |
Maturity date range, start | Jan. 01, 2015 |
Maturity date range, end | Dec. 31, 2017 |
Credit Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 183,000 | 200,000
Credit agreement, end of period interest rate | 2.62% | 2.53%
Year of maturity | 2018 |
Various Notes and Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,369 | $ 3,875
Various notes and mortgages, average end of period rate | 3.13% | 3.10%
Maturity date range, end | Dec. 31, 2021 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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